The only real problem for me with TXAA is blurriness on 3D Widgets. Sometimes 3D widgets are the only way because you want to overlay particles on your widgets which isn’t supported in UMG, so you have to go 3D with it. Other times, 3D widgets are a design choice. Objects can’t have AA turned off for them, so you either have to live with the blurriness (which just doesn’t work for some applications), use FXAA (which is vastly inferior), turn it off entirely (not ideal below 4k) or write your own AA solution (out of the realm of possibility for some people).
I really hope we get more AA options, like selective AA, though I’m not sure how feasible something like that would actually be. Failing that, more AA methods would be great, even if I have to buy it separately in the marketplace. Now there’s a marketplace suggestion!